You can on the smoother type but you musn't use on the curlies....it will tangle.
I used one for Huggy and it was a godsend..... just make sure that you use it lightly as it's quite sharp .
Huggy is on the right of my sig. Ambrose on the left is too curly for the furminator.

We purchased one for Vince but don't use it because it seems far to harsh on his coat it rip's out the undercoat far too much IMO after only only a few combs and leaves his coat looking and feeling rough and harsh to the touch
We've gone back to a wide toothed comb and bristle dog brush.

I think that a mixed doodle coat maintenance routine depends on each individual dog so it works for some and not for others. I should add that Vince's coat is a real mix of fur/wool/straight/whispy and curly.

My near neighbour who has two dear little Norwich Terriers use's one to strip out their coat's twice a year it works well for them

Vince doodle ...you will always find him in the kitchen at parties ......

I was given a furminator by Ralphie's previous owners. He is a curly coated doodle and he does get large matted patches which I really struggle to untangle. I have a few other brushes and a comb and use them in combination. I think I'm yet to find the ideal brush! He is booked in to be beautified on 7 February so I think I'll be going for a short cut this time!